18 years? Wow…time is staggering when you get around to quantifying it. :s
I’d definitely be working in a different field if not for the lenses. Having close-to-normal vision is a necessity in this day and age, and I wouldn’t make for a good draftsman if I couldn’t see my monitor…
…All things considered, I probably could go back to bi-focals. I’m just not sure I’d want to; the convenience outweighs the costs of usage i.m.o.